Video stream from BD is "Untranscoded" when imported

Hi! I've been creating custom discs for a personal back-up copy of a few movies. I ripped the M2TS files from the retail Blu-ray discs and imported them in Encore successfully.

However, in the case of only one particular movie, the M2TS video stream-only file shows as "Untranscoded" when imported....I tried a few things but nothing worked. I'm wondering why this specific file doesn't seem to be BD-compliant when no other showed any problem.